Michele guglielmo de simone



Nil. cs. DE SIMONE VARIABLE osCILLATIoN CONDENSER A l Re. 18,405

April 5, 1932.

Original Filed Nov.l 6, 1924 4 ATroRNEY Remind Api.' 5, 1932 MICHELE GUGLIELMO DE SIONE, OF STAPLETON, NEW YORK 'VARIABLE OSCILLTION CONDENSER Original Ho.'1,718,53 8, dated Imis 25, 1929, Serial No. 748,2811ed November 8," 1924.`

` reissue lecll January 17, 1931. Serial No. 509,514.-

This invention relates to variable condensersA and particularly of the radio frequency and other oscillation types.

Pursuant to my invention,` variation in capacitance is attained by the regulation of -the dielectric interposed between the plates of the rotor and stator of the condenser combined with theregulation of the extent of common e'iective area between the rotor and V stator plates. ,y

My invention is applicable to the rotary types of variable condensers whereby upon rotation of therotor shaft regulation of the capacitance is attained jointly by variationof elective areas of the rotor and stator plates by the imposed rotary movement combined all `operated memben ursuant to one preferred form of my invention as a plied to the imposed rotary types of-con enser, the rotor p ate or lates are lmounted upon a common shaft in t e desired spaced relation to one another and the axial movement of such shatcontrolled by a cam or equivalent having al1-effective cam face conforming tothe desired variation of axial displacement relative yto rotary displacement. 'A simple form of cam face for such axial displacement-cam is that of a constant itch. V v A urther feature of my invention'is the er at its minimum or maximum or intermediate settingby mountlng' 'a cam or other member for controlling the movement of the movable condenser blades, adjustably on the rotor shaft or linear displacement rod.

5 While my invention 1s particularly advanthe interposed dielectric and of the common adjustment of the capacitance ofla condens.-

Application for tageous in radio frequency and other oscillation condensers of the variable type, it will be perceived that my invention is also useful-- in variable condensers of general use in alternating and other forms of variable electrical currents.

Further features and objects of the invention willbe more fully/understood from the following detail description andthe accompanying drawings, in whichz 'so 'gure lis a top plan view of a rotary condenser embodying my invention ;V

Figure 2 is a sectional elevation on line 2-2 'of Figure 1;

Figure 3 is a sectional 3-3 of Figure 1.

Referrino' to Figures 1, 2 and 3, the frame of the condensercomprises the'front frame plate 10 and* rear frame plate 11, provided with suitable registering openings jon rotatably receiving the rotor shaft 12.` Infthe usual condenser, such shaft 12 is not insulated from the frame plates 10, 11, but if desired insulation may be had by the use of bushin s of fibre or other insulating material, 'It as will e understood.

Therotor plates 13 are secured to the rotor shaft 12 in any approved manner, but I prefer to position each rotor plate on the rotor shaft by reducing the diameter of the shaft 12 at the. locations 14, 14, corresponding 1n number to that of the rotor plates, to thereby form annular grooves alternately disposed between relatively raised annular rin s 15.v The securement of each rotor plate wit 85 in its groove 14.0!1 the shaft 12 maybe had lin any approved manner, andadvantageously by the provision of the retaining rods 16, 17 disposed on opposite sides of the shaft 12 and each anchored at its one :end within a. 490 suitable opening in the end block 18 and their opposite ends anchored in correspondingopenings in the opposite end block'19; such rods 16, 17 respectively pass through the registerving-openings 20, 21 in the Iears 22, 23 of the 95 respective rotor plates 13. The end block 18 is adjustably positioned on theshaft 12 by means of a set screw 24 and similarly the end block 19 by means of its set screw 25.

, Such annular grooves 14 on the rotor shaft lo@ elevation on line c5 12 are most accurately and most ex editious` ly, cut by means of gang cutter b ades in a screw machine,.wherebyv the width of each groove is accuratev within a one-half of' one thousandth of an inch or less of the thickness of each rotor plate at its mounting opening about its ears 22, 23. Such method of mounting attains far Greater uniformity of spacing and certaintyo retention vas compared with the heretofore use of collars cut of the small length corresponding to the spacing of the rotor plates andthreading the same on ythe rotor shaft.

On the opposite sides of the rotor I lates 13 similar form of insulating spacer 30 is employed at the opposite end of the rod 28 and similarly at both ends of each of the'rods 27 29; like reference numbers designate similarparts.

I prefer to space and secure the stator plates 26 on their respective mounting rods 27, 28, 29, similarly to that described hereinabove for mounting the rotor plates 13 on the rotor shaft 12. The grooves 33'are cut at the locations corresponding to the spacings' of the stator plates 26 and'of a width corresponding to the thicknesses of the end portions of each stator plate 26, as by means of gang cutter blades operated in a screw machine or the,

like. By reason of thev stator plates 26 being mounted between theirthree supporting rods 27 28, 29, retaining rods of the nature of the. aforesaid rods 20, 21 are not necessary, but may be employed.` The assembly of the stator plates 26 on and between their' suporting rods 27 28, 29 is most simply attained Ey slipping eac stator plate, see ig. 2, in its groove 33 of each of the rods 27, 28, 29 while the rods 27 28, 29 are loosely held in either one of the frame plates 10, 11, that is to say, 'having the screws 31 not full tightened and thereafter fully tightening tlyie screws 31 in both frame plates 10, 11, or the equivalent procedure.

Such form of spacing and retention of the stator plates 26, in addition to the advantages set forth above relative to the similar mounting of the rotor plates, insur against all distortion of any of the rods 27, 28, 29 or other displacement of any stator plate 26 on any of the rods 27 28, 29, due to. unequal or undue tightening u frame plates 10, 11, a ault most commonly of the rods in the 37,'suitably supported as by -means of the screws 38 tapped into the frame plate 11.

The shaft 12 may be operated manually i as by means of a suitable dial or finger piece or by any other approved means or may be lactuated by means of a pulley driven by a cord or belt or by'y any other approved form of mechanical means.

The cam 34 or Vequivalent is'preferably adjustably mounted on the shaft 12, as by forming the cam as a collar makin a loose fit at its inner opening with the sha 12 andpositioning the cam 34 by means of its set screw 39` passing through a suitable opening in the cam 34A and frictionally or otherwise engaging the shaft 12.

Such form-of the cam 34, orequivalent, aifords adjustment of setting of the cam 34 axially of the shaft 12 and also arcuately of the cam 34 relative tothe shaft 12. Bythe axial adjustmentvof the cam 34, the capacitance :of the condenser is set for the maximum value or any intermediate value below the maximum value of capacitance as may be p referred or desired. By the arcuate adjustment of the cam 34, the variation of the capacitance is set as desired for the particular extent or extents of arcs of rotational movement of the rotor plates relative to the stator plates.

By the use of the condenser set forth hereinabove, it will be observed that uponrotation of the shaft 12 the rotor plates 13 are i moved through an arccorrespondin-g to the arc of rotation imposed on the shaft 12 thereby varying the common eli'ecti-ve areas between the rotor plates and the stator plates and simultaneously therewith through an axial or longitudinal displacement of the shaft 12, thereby varying the interposition of dielectric between the lrotor vplates and the stator plates.

By forming the groove-35 of the cam 34,or

equivalent, with a zero pitch, the variation of capacitance is constant and dependent upon the arc of rotation solely, an'd my invention affords the regulation of the capacitance bythe adjustment of the cam 34, or equivalent, on the rotor shaft. A

In a similar manner, my invention is adapted for use of mechanical push and pull types of variable condensers,.namely upon linear displacement of the shaft, a cam controls the arcuate displacement of such shaft and theretype', the combination of-a set of rot'or plates,

.and serving as the movable condenser plates I andprojectin plates mounte mtionarily supported. y

.the stator plates.

alternately between similar on another-disk suitably sta- Condensers embodying 'm l applicable in use with circults of alll types,

'and the adjustment afforded by a cam or.

equivalent embodied in my invention enable's the rotor plates to be set to attain increased stability particularly at the criticalY values of capacitance, such asthe capacitance values approaching the minimum, at which stage the extent of interposition of the dielectric is increased and the common effective area greatly enlarge asl compared withv condensers as heretofore constructed. .In such forms of condensers embodying my invention, the maximum capacitance may be attained b'y locating the rotor. plates more closely toward Whereas I ,have` described my invention by reference to specific forms thereof,it will be understood'that many changes vand modiiicationsgmay be made without departing'from the spirit of the invention.

Having thus described my invention, what I claim is:

1. In an electrical condenser of the variable type, the combination of a setof rotor plates, rotary means' for supporting and rotatln said rotor plates, a set of stator plates, an adjustable cam' means for controlling the extentof dis lacement of said rotor,4 plates axiallyof sai' rotary supporting means inci dent to the rotation of sald rotorplates, said.' ele/ment ad'-l cam means comprising a vvcarri justably 'carried by said rotary supporting means.

2. In an electrical condenser of the variable a shaft for supporting and rotating said rotor plates, a set of stator plates, and adjustable cam means for control ing the extent' of displacement of said rotor plates axially ofcam means for control ing the extent of displacement of said rotor plates axially of said shaft incident to the rotation of said rotor plates, said cam means comprising a cam element adjustably lcarried by said shaft, said cam element having a cam groove and av pin cooperating with said cam groove. l

4. In an electrical condenser of the variable invention are adjustment is being made.

the extent of displacement of said rotor plates axially ofsaid shaft incident to the rotation of said rotor plates, said adjustable cam means comprising a cam element adjustably carried by said shaft, and a cooperating cam element carried by' said frame.

5. In an electrical condenser having a group of stator plates and a cooperating group of' rotorfplates and-means for varying irregularly the relative lateral position of the groups of plates as the rotor 1s turned.

6. /In an electricalcondenser having a group of stator plates and a cooperating group of rotor plates and means for shifting the rotor vplates laterally in any irregular manner as the rotor is turned.

7. In 'an electrical condenser -having a group of stator plates and a cooperating group of rotor plates and. means for'causing the stator and rotor plates and independent means for automatically and irregularly vchanging the relative lateral position of said groups of plates for obtaining maximum and minimum capacity curves andalso an intermediate variable curve. t

9. Iny an f electrical condenser having cooperative groups of plates, having relative adjustmenttherebetween, means for varying irregularly the relative lateral position of the groups as said adjustment is being made.

`10. An I electrical condenser having cooperative grouv s of plates with relative adf justment there etween, means for varying. lrregul'arly the relatively lateral position of at least one plate of the said groups as said In testimony'whereof, I ailix my signature. MICHELE GUGLIELMO DE SIMONE. 

